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$66+ Cheap flights from San Francisco to Denver (SFO - DEN)

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 10/4. Fares are subject to change and may not be available on all flights or dates of travel.
SFO — DEN
Oct 11 — Oct 181
Sat 10/11
Sat 10/18
1 adult, Economy
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Cheapflights Tip: The best prices from San Francisco to Denver Intl are usually found in October or January, booked 28 days in advance, depart on a Saturday or Friday and return on a Friday

Cheap flight deals from San Francisco to Denver

Discover tips and strategies to find the most affordable flight options for your journey from San Francisco (SFO) to Denver (DEN). Learn about various techniques such as flexible date searches, comparing prices across and setting up price alerts. Use these methods to find the cheapest flights available for your travel needs. Data last updated September 11, 2025.

Round-trip from

$107
(Cheapflightsfares)

One-way from

$66
(Kiwi.com)

Popular in

June

Cheapest in

October

Average price

$198

Good round-trip deal

$180 or less

Good one-way deal

$120 or less
From San Francisco to Denver Intl
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One-way flight from San Francisco to Denver Intl
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Highest demand for flights based on searches. 11% potential increase in price ($30 potential increase over avg. RT price).
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Cheapest flight prices on average. 2% potential price decrease ($5 potential savings vs. average RT price).
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Average for round-trip flights in September 2025
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Price to beat on a round-trip flight from San Francisco to Denver Intl.
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Price to beat on a one-way flight from San Francisco to Denver Intl.
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Find flight deals from San Francisco to Denver

Cheapest flights from San Francisco to Denver
Explore the most affordable flight options available from San Francisco to Denver. Find the lowest fares from popular airlines and budget airlines, with prices last updated on September 11, 2025.

This Cheapflightsfares deal was found by Cheapflights users on 9/11. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 11/28:09 pmSFO - DEN
Nonstop2h 41mFrontier
Mon 11/39:48 amDEN - SFO
1 stop5h 16mFrontier
Deal found 9/11$107
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 10/202:53 pmSFO - DEN
1 stop8h 53mFrontier
Tue 10/218:39 pmDEN - SFO
Nonstop2h 48mFrontier
Deal found 9/10$108
This Cheapflightsfares deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Thu 11/65:45 amSFO - DEN
1 stop21h 14mFrontier
Sun 11/97:45 amDEN - SFO
Nonstop2h 48mFrontier
Deal found 9/10$109
This Cheapflightsfares deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sat 10/410:49 amSFO - DEN
Nonstop2h 41mFrontier
Sun 10/56:36 pmDEN - SFO
1 stop23h 03mFrontier
Deal found 9/10$110
This Cheapflightsfares deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/296:34 amSFO - DEN
Nonstop2h 44mFrontier
Thu 10/309:48 amDEN - SFO
1 stop5h 21mFrontier
Deal found 9/9$111
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Mon 9/293:28 pmSFO - DEN
1 stop11h 32mFrontier
Sun 10/56:30 amDEN - SFO
Nonstop2h 45mFrontier
Deal found 9/10$112
This Kiwi.com deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Kiwi.com is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/146:34 amSFO - DEN
Nonstop2h 44mFrontier
Mon 11/36:30 amDEN - SFO
1 stop9h 59mFrontier
Deal found 9/10$113
This CheapOair deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure CheapOair is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/2810:11 pmSFO - DEN
1 stop20h 20mFrontier
Fri 10/36:30 amDEN - SFO
Nonstop2h 45mFrontier
Deal found 9/10$114
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Sun 9/286:29 amSFO - DEN
Nonstop2h 39mFrontier
Wed 10/88:39 pmDEN - SFO
Nonstop2h 48mFrontier
Deal found 9/10$115
This Frontier deal was found by Cheapflights users on 9/10. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Frontier is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Tue 10/76:34 amSFO - DEN
Nonstop2h 44mFrontier
Tue 10/78:39 pmDEN - SFO
Nonstop2h 48mFrontier
Deal found 9/10$116
This Cheapflightsfares deal was found by Cheapflights users on 9/9. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Cheapflightsfares is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Wed 10/17:10 amSFO - DEN
Nonstop2h 37mFrontier
Sun 10/56:30 amDEN - SFO
Nonstop2h 45mFrontier
Deal found 9/9$117
This Priceline deal was found by Cheapflights users on 9/8. Clicking the “Pick Dates” button in this card will allow you to select your dates and further customize your flight criteria. From there, click “Find deals”, make sure Priceline is selected, and click “Compare selected” under the list of providers to see comparable flight deals.
Fri 12/127:53 pmSFO - DEN
Nonstop2h 40mFrontier
Sun 12/145:00 pmDEN - SFO
Nonstop2h 55mFrontier
Deal found 9/8$118

Cheapflights Fare Finder

 
Customize your flight search to find flights from San Francisco to Denver that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
Use the filters below to find and compare flights from San Francisco to Denver that are best for you.

Fly from

San Francisco

Fly to

Denver

Route

Depart

Return

Price

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/22

8:52 pm-12:29 am

Nonstop2h 37m

Denver Intl

Sun 10/26

6:00 am-7:49 am

Nonstop2h 49m

$177

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-11:51 pm

1 stop15h 51m

Denver Intl

Tue 11/4

8:20 am-10:01 pm

1 stop14h 41m

$183

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-7:06 pm

1 stop11h 06m

Denver Intl

Wed 11/5

8:20 am-10:01 pm

1 stop14h 41m

$183

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-7:06 pm

1 stop11h 06m

Denver Intl

Sat 11/1

12:49 pm-9:09 pm

2 stops9h 20m

$193

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-11:51 pm

1 stop15h 51m

Denver Intl

Thu 11/6

12:49 pm-11:46 pm

1 stop11h 57m

$193

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 11/5

2:26 pm-11:51 pm

2 stops8h 25m

Denver Intl

Mon 11/10

11:31 am-5:22 pm

1 stop6h 51m

$199

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Tue 11/11

2:26 pm-11:51 pm

2 stops8h 25m

Denver Intl

Mon 11/17

6:46 pm-8:55 am

1 stop15h 09m

$199

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-11:51 pm

1 stop15h 51m

Denver Intl

Mon 11/3

7:19 pm-11:46 pm

1 stop5h 27m

$200

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Wed 10/29

7:00 am-7:06 pm

1 stop11h 06m

Denver Intl

Fri 11/7

7:19 pm-11:46 pm

1 stop5h 27m

$200

San FranciscoDenver

SFO - DEN

SFODEN

San Francisco

Tue 9/30

8:52 pm-12:29 am

Nonstop2h 37m

Denver Intl

Sat 10/4

1:30 pm-3:12 pm

Nonstop2h 42m

$203

Flights are sorted by cheapest round-trip flights first.

Deals found on 9/10

Showing 1-10 of 22 results
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The best insider tips for San Francisco to Denver flights

Snippets provided in this section are AI-generated based on a summarization of Cheapflights-commissioned articles. The articles are presented as-is, for general informational purposes only, and may not be up-to-date. The opinions contained in the articles are original to the author and reflect their authentic experience, which may vary significantly from the experience of others.
Cheapflights partnered with top experts to bring you the best recommendations for your San Francisco to Denver trip
Airlines
Frontier

Frontier's UpFront Plus seats guarantee an empty middle seat for added comfort.


Early morning flights have a better chance of on-time departure and arrival.

Read more about Frontierby Marisa Garcia
United Airlines

Basic Economy allows a personal item only; no carry-on bags unless you're a MileagePlus member.


Economy Plus offers extra legroom seats at the front of the economy cabin for MileagePlus members.

Read more about United Airlinesby Harriet Baskas
Airports
SFO

Save time by using the SFO2Go program to order meals for pickup during busy times.

Read more about SFOby Harriet Baskas
DEN

Take the A Line train from DEN to Union Station for a quick, 37-minute ride into downtown Denver.

Read more about DENby Emily Zemler
Our travel experts
Marisa Garcia

Marisa Garcia

Expert on Frontier

Marisa Garcia

Marisa Garcia

Marisa knows planes inside and out, spending 16 years working on aircraft in hangars at airports around the world. She is an aviation industry expert, specialized in airline interiors and regulations. Ten years ago, she pivoted to journalism. She shares her insights in leading aviation, travel, and business publications and on her site FlightChic.

Read more
Harriet Baskas

Harriet Baskas

Expert on United Airlines and SFO

Harriet Baskas

Harriet Baskas

Harriet is an award-winning journalist who is happiest in an airport or an unusual museum. Her stories about airports, air travel, and the business of travel have appeared on NBC News, CNBC, USA TODAY, The Points Guy and other outlets. She is the creator of the StuckatTheAirport.com blog and the author of nine books. When not out on the road or exploring the latest airport amenities, she’s home in Seattle getting ready for the next adventure.

Read more
Emily Zemler

Emily Zemler

Expert on DEN

Emily Zemler

Emily Zemler

Emily is a freelance writer and book author based in London covering entertainment and travel. Her work has appeared in Los Angeles Times, Observer, and Conde Nast Traveler She has ventured to more than 40 countries and all seven continents, always in search of a great art museum. She has written extensively about hotels, luxury travel, and aviation.

Read more

Best time to book a flight from San Francisco to Denver

Have a flexible travel schedule? Discover the best time to fly to Denver from San Francisco with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from San Francisco to Denver

How far ahead should I book a flight from San Francisco to Denver?

Use this chart to determine the optimal time to book a round-trip flight from San Francisco to Denver. Price data was last updated on August 29, 2025.

To ensure you get the cheapest price possible for a flight from San Francisco to Denver, you should look to book at least 28 days in advance of your intended travel date. The price of your flight may increase if you delay and leave booking until a week or so before departure.

What is the cheapest month to book a flight from San Francisco to Denver?

Currently, October is the cheapest month in which you can book a flight from San Francisco to Denver (average of $197). Flying from San Francisco to Denver in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from SFO to DEN?

Find hourly flight availability from San Francisco to Denver. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated September 11, 2025.

One of the essential ways to save on airfare from San Francisco to Denver is to remain as flexible as possible. Flights that are at noon tend to be the most expensive. A flight in the evening could potentially save you up to 27% on airfare.

What is the cheapest day to fly from San Francisco to Denver?

Use this chart to determine the cheapest time to fly round-trip from San Francisco to Denver. Price data was last updated on September 7, 2025.

Travelers seeking maximum savings on their San Francisco to Denver flight should consider departing on Friday evenings when fares are most often at their lowest. Sunday at noon flights should be avoided if possible as fares are typically the most expensive at this time.

Reviews of airlines servicing Denver

Get insights into the airlines that provide service to Denver. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Denver. Reviews last updated September 11, 2025.
Get a feel of what it's like to fly with Southwest, United Airlines, and American Airlines from San Francisco to Denver by reading reviews from past customers. Users have also rated airlines in terms of entertainment options, comfort, food, crew/service, and boarding process.
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Southwest
8.0
Very good
4,248 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
United Airlines
7.4
Good
8,937 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
American Airlines
7.2
Good
10,000 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Allegiant Air
7.2
Good
702 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.
Frontier
5.8
Fair
3,177 reviews
Southwest
8.0
Very good
4,248 reviews

Entertainment

7.5

Boarding

8.1

Comfort

8.0

Crew

8.6

Overall

8.0

Food

7.0

Reviews

1 / 20
8.0
Excellent

Walter,Aug 2025

OAK - SAN

Dozens of flights and I've never seen a row's beverages forgotten. I even went back and asked the attendant to check on them and nothing. I really hope it didn't have something to do with the Black mother with her kid in the row. Otherwise it was a typical Southwest flight, rapid boarding, tolerable leg room.

Related info for your journey

Find useful and relevant information for your journey from San Francisco to Denver. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airports do I use to fly from San Francisco to Denver?

    To fly from San Francisco to Denver, you need to book a flight from San Francisco (SFO) to Denver Intl (DEN). Nonstop flights to Denver Intl from San Francisco take 2h 25m on average. When it comes time to book airfare, you have a few options: there are 39 outbound flights from San Francisco to Denver Intl offered by 7 different airlines.

  • How popular is this San Francisco to Denver flight route?

    The San Francisco to Denver Intl flight path was viewed by 281 users in the past month. Keep an eye out for changes in search interest prior to high and low season.

  • How long is the flight from San Francisco to Denver?

    For as low as $177, United Airlines can have you in Denver from San Francisco in 2h 37m. The distance from San Francisco to Denver is about 964 mi. This flight may include one or multiple stops.

  • What are the cheapest airlines flying from San Francisco to Denver round-trip?

    Flying on Frontier is currently your cheapest option to Denver, with prices starting at $66. Additional round-trip tickets that might be worth considering are offered by Allegiant Air and Alaska Airlines, with the lowest prices starting at $88 and $116, respectively. Frontier is 71% cheaper than the average price of flights available within the next 90 days to this destination.

  • What are the cheapest airlines to fly from San Francisco to Denver one-way?

    $67 is the cheapest one-way deal found within the past few days, from United Airlines. You may also be able to find cheap deals on Alaska Airlines and Southwest, with prices starting from $76 and $77, respectively.

  • What are the most reliable airlines from San Francisco to Denver?

    Looking for the most reliable airlines to get you to your destination on time? Our data shows these are most likely to get you from San Francisco to Denver on time: Asiana Airlines (83%), Air Canada (73%), Virgin Australia (72%).

  • What are the cheapest flights from San Francisco to Denver?

    Looking at all options, your cheapest flight can be booked for $68. While the most popular route (San Francisco - Denver Intl) can be booked for $61 on average, our data indicates $976 when flying from San Francisco to Denver.

  • Can I find deals for flights from San Francisco to Denver that include hotel bookings?

    Yes. In addition to deals on San Francisco to Denver flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from San Francisco to Denver?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from San Francisco to Denver.

  • Can I find deals for business class flights from San Francisco to Denver?

    Yes. Cheapflights offers flight deals from San Francisco to Denver by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from San Francisco to Denver?

    Currently, October is the cheapest month in which you can book a flight from San Francisco to Denver (average of $197). Flying from San Francisco to Denver in March is currently the most expensive (average of $278). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

Traveling to a place near Denver?

Book flights to Denver if you plan to visit one of these locations
Westminster
Black Hawk
Golden
Winter Park
Broomfield
Greeley
Lone Tree
Lakewood
Cripple Creek
Thornton
Silverthorne
Frisco
Manitou Springs
Fort Morgan
Glendale
Wheat Ridge
Brighton
Longmont
Idaho Springs
Parker

Browse thousands of different options on Cheapflights for your next trip

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Top 7 airlines flying from San Francisco to Denver

Discover the top 7 airlines that operate flights from San Francisco to Denver. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 2,558,603 searches. Data last updated September 11, 2025.
AirlineCheapestAverageFlexibilityOn-time
FrontierCheapest$66Average$175FlexibilityNo cancel feeOn-time62%
Allegiant AirCheapest$88Average$100FlexibilityNo cancel feeOn-time88%
Alaska AirlinesCheapest$116Average$264FlexibilityNo cancel feeOn-time75%
SouthwestCheapest$157Average$275FlexibilityNo cancel feeOn-time63%
United AirlinesCheapest$165Average$336FlexibilityNo cancel feeOn-time69%
American AirlinesCheapest$176Average$339FlexibilityNo cancel feeOn-time71%
DeltaCheapest$206Average$276FlexibilityNo cancel feeOn-timeN/A

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